No blooms on Climbing Hydranga - Knowledgebase Question

I think your plant is mature enough to bloom so I'm not sure why it won't bloom for you. You can prune it back a bit to encourage new growth. Flowers develop on the new growth of the season so I think pruning will prompt flowering. You can feed your hydrangea with a bloom booster type fertilizer (one with a low first number but high second and third numbers on the package). Apply in amounts as recommended on the label and scratch it into the soil around the roots of your hydrangea. Hope these techniques result in flowers!